Fix windows ghcup installation

Author: hasufell

.github/scripts/env.sh

@@ -14,6 +14,7 @@ export BOOTSTRAP_HASKELL_NONINTERACTIVE=1
 export BOOTSTRAP_HASKELL_CABAL_VERSION="${CABAL_VER:-3.8.1.0}"
 export BOOTSTRAP_HASKELL_ADJUST_CABAL_CONFIG=no
 export BOOTSTRAP_HASKELL_INSTALL_NO_STACK=yes
+export BOOTSTRAP_HASKELL_ADJUST_BASHRC=1
 
 if [ "${RUNNER_OS}" = "Windows" ] ; then
     # on windows use pwd to get unix style path